Instruction manual
6. Troubleshooting
6-4
RF-20A/20Axs
∗1 For details on the method for checking for air bubbles and contamination inside the cell, see:
^ "8.2 Inspection and Simple Washing of the Cell" P.8-5
Chromatogram
peaks are
trapezoidal.
The setting for [SENS] in the
parameter settings group is too
high.
• Lower the setting for [SENS] in the
parameter settings group.
P.5-19
The concentration of the sample
is too high, or the volume poured
in is too large.
• Dilute the sample or reduce the
volume poured in.
−
Spiking
Sawtooth
baseline
Continuous
spiking
Are air bubbles entrained in the
cell? (∗1)
• Connect a back pressure device or
φ 0.3 mm × 2 m tubing to the flow
cell outlet tube and apply pressure.
−
• Degas the mobile phase.
(Use the degasser.)
−
Continuous
spiking
Spiking that
occurs with
every pump
stroke
Have air bubbles built up inside
the cell? (∗1)
• Connect a back pressure device or
φ 0.3 mm × 2 m tubing to the flow
cell outlet tube and apply pressure.
−
• Using the syringe provided as an
accessory, clean the inside of the
flow cell with 2-propanol.
P. 8 - 5
Drift
Noise (large)
Rise
Is the cell contaminated? (∗1)
• Disassemble the flow cell unit and
clean the cell. If the contamination
cannot be removed, replace the cell.
P. 8 -11
Is the lens soiled?
• Disassemble the flow cell unit and
clean the lens. If the contamination
cannot be removed, replace the
lens.
−
If the drift stops when pumping is
stopped, have impurities become
entrained in the mobile phase?
• Inspect the mobile phase and the
mobile phase flow line, and remove
impurities.
−
Wander of the
baseline
Is a strong airflow blowing directly
onto the instrument?
• Prevent the airflow from blowing
directly onto the instrument by using
e.g. a screen.
• Change the installation position.
−
Noise
corresponding
to the pump
stroke
Is the mobile phase pulsating?
• Eliminate the pulsation from the
pump unit.
• Use a pulsation absorption device.
−
Noise (large)
Deterioration or life expiry of the
lamp
• Replace the lamp.
P.8-30
Symptom Probable Cause Corrective Action Page